Browser Gamma Correction Test Page

ICC-profile-labelled PNGs (1/1.0) on HTML Colors

This page was created in order to test the self-consistency of web browsers'
gamma correction. In brief, if they gamma-correct HTML colors on non-sRGB
systems (which would be proper, according to the HTML 4.01 specification),
then they should also gamma-correct unlabelled images in the same way.
Alternatively, if they don't gamma-correct HTML colors (which also is allowed
in HTML 4.01, unlike
in CSS), then they should not gamma-correct unlabelled images, either.
In the latter case, however, labelled images (such as PNGs with a gAMA,
cHRM, sRGB or iCCP chunk, including the ones on this page) are unlikely to
match the HTML colors across all platforms.

This version of the page uses PNG images labelled with an ICC
profile (and no gAMA chunk) as being in the gamma 1/1.0 (linear) color
space, and HTML colors for the backgrounds of the table cells.
The ICC rendering intent is "ICC-absolute colorimetric."
The images will be distinct from the cell backgrounds if the browser
fails to gamma-correct both the PNGs and the HTML colors, and the system
is sRGB (such as most Windows- and Unix-based PCs); or if it gamma-corrects
only one of the two on a non-sRGB system (such as most Macs, SGIs and
NeXT cubes). If the browser gamma-corrects both (and does so correctly!),
the edges of the images will be invisible on all systems. This will also
be the case on sRGB systems if the browser gamma-corrects only the PNGs,
however.